<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background: url("img/yzbg.jpg");
        }
        ul {
            width: 400px;
            height: 400px;
            margin: 140px auto;
            position: relative;
            list-style: none;
        }
        ul li {
            border: 2px solid #394057;
            position: absolute;
            left: 50%;
            top: 50%;
            border-radius: 50%;
            transform: translate(-50%,-50%);
            box-sizing: border-box;
            animation-name: orbit;
            animation-timing-function: linear;
            animation-iteration-count: infinite;
        }
        ul li span {
            display: block;
            position: absolute;
            left:0;
            width: 12px;
            height: 12px;
            border-radius: 50%;
        }
        ul li:nth-child(1) {
            width: 60px;
            height: 60px;
            border: none;
            box-shadow: 0 0 50px #c90;
            background-color: #c90;
            animation-duration: 5s;
        }
        ul li:nth-child(2) {
            width: 120px;
            height: 120px;
            animation-duration: 6s;
        }
        ul li:nth-child(2) span {
            background-color: yellow;
            left: 80px;
            top: 0;
        }
        ul li:nth-child(3) {
            width: 180px;
            height: 180px;
            animation-duration: 10s;
        }
        ul li:nth-child(3) span {
            background-color: blue;
            left: 47px;
            top: 0;
        }
        ul li:nth-child(4) {
            width: 240px;
            height: 240px;
            animation-duration: 12s;
        }
        ul li:nth-child(4)>span {
            background-color: green;
            left: 209px;
            top: 43px;
            animation-duration: 2s;
        }
        ul li:nth-child(4)>span>span {
            width: 6px;
            height: 6px;
            left: 16px;
            background-color: yellow;
        }
        ul li:nth-child(5) {
            width: 300px;
            height: 300px;
            background-image: url("img/stone.png");
            background-size: cover;
            animation-duration: 25s;
        }
        ul li:nth-child(5) span {
            background-color: red;
            left: 95px;
            top: 0;
        }
        ul li:nth-child(6) {
            width: 360px;
            height: 360px;
            animation-duration: 20s;
        }
        ul li:nth-child(6) span {
            background-color: #ccc;
            left: -5px;
            top: 200px;
        }
        ul li:nth-child(7) {
            width: 420px;
            height: 420px;
            animation-duration: 30s;
        }
        ul li:nth-child(7)>span {
            background-color: green;
            left: 300px;
            top: 18px;
        }
        ul li:nth-child(7)>span>span {
            width: 15px;
            height: 15px;
            border: 2px solid #ccc;
            left: -4px;
            top: -4px;
            transform: skew(10deg,45deg);
        }
        ul li:nth-child(8) {
            width: 480px;
            height: 480px;
            animation-duration: 35s;
        }
        ul li:nth-child(8) span {
            background-color: pink;
            left: 0;
            top: 170px;
        }
        ul li:nth-child(9) {
            width: 540px;
            height: 540px;
            animation-duration: 40s;
        }
        ul li:nth-child(9) span {
            background-color: blue;
            left: 47px;
            top: 100px;
        }
        ul li:nth-child(10) {
            width: 600px;
            height: 600px;
            animation-duration: 45s;
        }
        ul li:nth-child(10) span {
            background-color: yellow;
            left: 224px;
            top: 0;
        }
        @keyframes orbit {
            0% {
                transform: translate(-50%,-50%) rotate(0deg);
            }
            100% {
                transform: translate(-50%,-50%) rotate(360deg);
            }
        }
    </style>
</head>
<body>
<ul>
    <li></li>
    <li><span></span></li>
    <li><span></span></li>
    <li><span><span></span></span></li>
    <li><span></span></li>
    <li><span></span></li>
    <li><span><span></span></span></li>
    <li><span></span></li>
    <li><span></span></li>
    <li><span></span></li>
</ul>
</body>
</html>